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Insulation in Custer: July highs average about 84°F; January lows average about 14°F.
In Custer County, July highs average about 84°F and January lows about 14°F, with roughly 19 inches of rain a year. Long, cold winters put furnaces and pipes to the test.
Over the last 10 years the National Weather Service recorded hailstorms, damaging thunderstorm winds and floods in Custer County, with hail up to 2.75 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Custer County has had 10 federal disaster declarations in the last 25 years, most often for wildfires; the latest was Straight-Line Winds (2026).
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Uneven rooms, high bills and an attic you can see the joists in are the signs; older homes often have far too little.
Attic insulation and air-sealing usually pay back fastest.
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